Calcium Fluoride (CaF2) VUV and IR grade.
Calcium Fluoride (VUV grade) has transmission range 0.19m m to 7.2m m. The refractive index varies from about 1.35 to 1.51 through this range. IR grade Calcium Fluoride is transparent up to 12m m. Degradation due to moisture in the atmosphere is minimal, and polished surfaces may be expected to withstand several years exposure to normal atmospheric conditions. Due to its low refractive index, Calcium Fluoride can be used without an anti - reflective coating. Low solubility and wide transmission makes this material useful for many applications, including mirror substrates for UV laser systems, windows, lenses and prisms for UV and IR applications.The maximum temperature CaF2 can tolerate it is 800
0 C in dry atmosphere. Irradiation of Calcium Fluoride causes some loss in UV transmission. The material is sensitive to thermal shock.Physical Properties
| Crystal type | cubic |
| Lattice constant | a = 5.462Å |
| Density | 3.18g/cm3 |
| Melting point | 1418 °C |
| Refractive index | n = 1.50 @ 0.2 mm |
| Thermal expansion coefficient | 18.85*10-6/°C (20°C - 60°C) |
| Transmission band | 0.19 - 7.2 mm (VUV Grade) |
OpticsLand(TM) manufactures CaF2 lenses, prisms, windows, mirrors etc. Examples of CaF2 optical components are shown below. Please contact OpticsLand for other sizes or specifications
CaF2 windows
| Material | optical quality CaF2 (Dn/cm < 0.5*10-5) |
| Surface Quality | 40 - 20 scratch & dig |
| Clear aperture | 90% of diameter |
| Diameter tolerance | +0.0, -0.1 mm |
| Thickness tolerance | ±0.2 mm |
| Flatness | l/10 @ 633 nm |
| Parallelism | 3 arcmin |
| Material | Diameter, mm |
Thickness, mm |
Cat.-No. |
Price, US$ |
| UV grade CaF2 |
25.4 |
3.0 |
40401 |
125 |
38.1 |
5.0 |
40402 |
160 | |
50.8 |
6.0 |
40403 |
300 |
|
| IR grade CaF2 |
25.4 |
3.0 |
40501 |
105 |
38.1 |
5.0 |
40502 |
158 |
|
50.8 |
6.0 |
40503 |
260 |
|
70.0 |
10.0 |
40505 |
320 |
- always in stock
CaF2 prisms
Dispersion prisms from highest quality of UV (VUV) Grade CaF2.
The working angle is 67 deg (Brewster for ArF laser)
Calcium Fluoride Transmission
Calcium Fluoride Refractive Index vs. Wavelength
| l (m m) | n |
l (m m) |
n |
l (m m) |
n |
0.19 |
1.51 |
0.33 |
1.45 |
5.80 |
1.39 |
0.20 |
1.50 |
0.41 |
1.44 |
6.20 |
1.38 |
0.21 |
1.49 |
0.88 |
1.43 |
6.70 |
1.37 |
0.22 |
1.48 |
2.65 |
1.42 |
7.00 |
1.36 |
0.25 |
1.47 |
3.90 |
1.41 |
7.50 |
1.35 |
0.27 |
1.46 |
5.00 |
1.40 |
8.22 |
1.34 |
OpticsLand, a precision optics division of Del Mar Ventures, produces precision ultraviolet, visible and infrared optics from fused silica, crystal quartz, lithium fluoride, calcium fluoride, barium fluoride, magnesium fluoride, silicon, sapphire, germanium, calcite, glass, zinc selenide and other materials. The product line includes lenses, windows, prisms, mirrors, polarizers, retarders, beamsplitters, filters, etalons etc. OpticsLand provides engineering and contract manufacturing of precision optical components and systems. OpticsLand home
Optical quality calcium fluoride is recommended for windows, prisms and lenses for use in the infrared.
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